Composite structure



June 9, 1942. .1.A l.. RoDGERs, JR., 4Erm. `I 2,2g5614 COMPOSITE STRUCTURE Filed July 28, 1958 MII ,f ff/ /1 Illini James L. ,Qa

ATTORNEYS water base.

Patented June 9, 1942 COMPOSITE STRUCTURE James L. Rodgers, Jr., New York, N. Y., and Charles E. Slaughter, New Canaan, Conn.,` assignors to Plaskon Company, Incorporated.

Toledo, Ohio, a corporation of Delaware Application July 28, 1938, Serial No. 221,758

The invention relates to composite structures made of synthetic resins or plastics, and its principal object is to provide a composite structure having valuable properties that cannotv be obtained by use of any one of the structural materials alone.

More specific objects and advantages are apparent from the description, in which reference is had to the accompanying drawing illustrating a preferred embodiment of the invention.

Fig. I is a vertical section of a composite container constructed in accordance with theV invention.

Fig. II is a plan thereof, with -a portion of the cover broken away.

This speciflc drawing and the specific description that follows merely disclose and illustrate the invention, and are not lintended to impose limitations upon the claim.

In the manufacture of a composite structure in accordance with the invention, an outer body of formaldehyde-urea. resin is rst formed by casting or pressing in a mold at an elevated temperature. Formaldehyde-urea resin is of the thermosetting type, so that a body of the resin which has once been fused in a mold is infusible. The resin is also superior to other plastics in that it is insoluble in organic solvents and is highly resistant to light. However, a formaldehydeurea resin suffers slight surface deterioration upon exposure to water, so that formaldehydeurea resin is not widely used for cosmetic jars that are to be filled with face creams having a Yet formaldehyde-urea resin is a. highly desirable material for toilet articles and jars, because of the fact that it can be used to make pure White or delicately tinted articles.

In accordance with the invention, therefore,

4a composite structure such as a cosmetic jar is made from an outer body of formaldehyde-urea 40 resin, and an inner shell of a` water-resistant thermoplastic resin, such as a resin of the poly' styrene or vinyl type. In order to afford full protection against the permeation of moisture to the formaldehyde-urea resin, a liner of metal foil, such as aluminum or tin foil, may be employed between the body of formaldehyde-ureal resin and the inner shell of thermoplastic resin. The liner of metal foil can be applied inside the body portion, and the thermoplastic inner shell can be cast in place at an elevated temperature. The infusible formaldehyde-urea resin is protected by the metal foil and is not affected by the elevated temperature. Preferably, the inner f shell of thermoplastic resin is iniection-molded into place.

' In the Jar shown in' the drawing an outer body III. of formaldehyde-urea resin is externally threaded adjacent its upper edge and is provided with a liner II of metal foil and a thin inner shell I2 of a water-resistant thermoplastic resin. On the inner wall of the body I0 are undercuts I 3 into which the thermoplastic resin ilows when the inner shell I2 is molded into place. It should be noted that the inner shell I2 is provided with a bead- Il against which the internally threaded cover I5 bears. The cover I5 is provided with the usual paper liner I 6, and may be formed of formaldehyde-urea resin or any other desired material.

Various embodiments of the invention may be devisedl to meet various requirements.

Having described our invention, we claim:

A composite container comprising an outer body of formaldehyde-urea resin having an undercut recess 'in its inner walll a liner of metal foil,l and an inner shell of a water-resistant thermoplastic resin formed into place, the material of said inner shell extending into .such undercut recess in the wall of said outerbody.

' JAMES L. RODGERS. Jn.

CHARLES E. SLAUGHTER. 

